Object not receiving message
Possible cause: combination with keyboard sensor

Just as it is the configuration looks fine. But there is a danger.

You combine the message detection with keyboard detection. That means the actuator will only be activated when you hold the specified key  and receive a message at the same time. 

It might be you want to activate the motion actuator when either the key is pressed or a message is received. In that case I suggest to replace the AND controller with an OR controller.

To analyze if the message can be received at all, you can disconnect the keyboard sensor (leaving the message sensor).

To analyze if the motion actuator has any effect on your object, you can disconnect the message sensor (leaving the keyboard sensor).

I hope it helps